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Question

An inclined plane is making an angle β with horizontal. A projectile is projected from the bottom of the plane with a speed u at an angle α with horizontal then the time of flight T is:

A
T=2usin(αβ)gcosβ
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B
T=usin(αβ)gcosβ
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C
T=2usin(α+β)gcosβ
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D
T=usin(α+β)gcosβ
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Solution

The correct option is B T=2usin(αβ)gcosβ
Velocity perpendicular to the inclined plane uv=usin(αβ)
a=gcosβ
t=T
s=0
0=usin(αβ)T12(gcosβ)T2
T=2usin(αβ)gcosβ
70143_2654_ans.jpg

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